You seem a very loving person, caring for the feelings of your parents. That's wonderful.
Focus right now on your education, to be able to live once on your own and be financially stable. Make strong friendships with loving and caring persons who are no JWs (there are many).
Don't be sad for your parents if you leave home to be on your own. That's just normal, also that your parents might be a bit sad and would wish that you always remain their little girl. But their little girl is adult now, which means freedom for you to make decisions in your life. You ARE always their girl, and there should be a loving bond between you and your parents for all your life. At least try everything in your power to do that.
You can fade, get disfellowshipped or disassociate. I think no matter which way you choose, your parents will realize that your faith changed. Of course that would make them sad, but they will cope.
I had open discussions with my parents about all the things in JW land that I couldn't deal with anylonger (blood, shunning, child abuse, cruelties committed by Jah in the bible ...). Finally I was disfellowshipped because of my differing views. It made my mum sad, but she learned to accept, that I have to live according to my conscience. I still have a normal and great relationship with my parents. They don't listen to the shunning rules, because they don't approve of them too. Of course I was lucky. Other parents react differently.
I suggest you to live YOUR life, be happy and joyful, try hard to do good (maybe use your freetime that you get from not doing field service to do volunteer work for helping others, furthering human rights, animal rights, whatever you like) so your parents see that you do good even though you are not doing jw stuff. Form new friendships and allow love in your life.
Every parent needs to learn to let their children make their own life decisions. Also I need to do that one day (my son is 3 years old now).
I am sure your parents will learn that too and will be proud of you as you are a very loving and caring person.